SSL session cache full

Cox, Eric S eric.cox at
Mon Mar 16 13:58:29 UTC 2020

How can this be monitored however?

-----Original Message-----
From: nginx <nginx-bounces at> On Behalf Of Maxim Dounin
Sent: Monday, March 16, 2020 8:33 AM
To: nginx at
Subject: Re: SSL session cache full

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On Mon, Mar 16, 2020 at 12:36:21AM -0700, Frank Liu wrote:

> I have a question after reading .
> When that alert is logged in error log, what will happen to the connection?
> Will the client get an error (such as HTTP 4XX), or will it work as if
> the server doesn't support session resumption?
> As mentioned in comment3 in that ticket, for 2-way SSL clients, this
> could happen more frequently, will nginx fail the 2-way SSL handshake
> and give 4xx error?

The error in question simply means the session won't be cached, so it cannot be resumed later.  No SSL handshake or HTTP level errors will happen.

Maxim Dounin
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nginx at


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